mike.warrenws6

im curious as to what these block of plates too, im thinking about getting them, just wanna make sure its okay. I dont have emissions or anything either. will i see any better performance out of the motor?

jdob84

iTrader: (1)

Block 'em off and don't look back! All the egr stuff is good for is robbing horsepower!

Starz T/A 17

iTrader: (6)

Actually the AIR/ EGR don't rob HP at all. The 2 major reasons why people remove them on stock cars are 1. to remove some weight off of the car and 2. it really does clean up the engine bay alot.

To answer the OP's question, the block off plates block off the EGR port on the intake manifold and the AIR ports on the exhaust manifolds so that the manifolds don't leak after the AIR/ EGR systems have been removed on a stock car. Most people who go with headers and an aftermarket manifold don't need block off plates because a lot of aftermarket manifolds can be ordered without the ports for EGR/ AIR.

jdob84

iTrader: (1)

I would tend to disagree with that statement. The egr returns unburned fuel vapors back into the intake. Because of this, it also returns some of the exhaust gases as well. By blocking the egr, you are not allowing the unburned mixture to return, and relying more on the fresh air from the front of the intake. Cleaner air= better combustion= better performance= hp.

I do agree that removing it does remove weight, and helps clean up the engine compartment though. Also, taking the egr might lead to worse mileage... But mpg isn't the biggest concern for quit a few of us. Lol

Fuego

Anyone have pics of this block off plate? Is it the hole on top of the intake that you guys are talking about?

Mattyfresh89

Yes, heres a picture of the hole plugged with an expandable rubber plug sold at advance and auto zone



I forget the exact size,i think it was 1&3/8"

Fuego

Thanks mattyfreshsodef... lol! Didn't know about being able to plug this guy off on my LS1 intake and bought another intake local on CL. Not complaining though... found an LS6 intake w/ rails and injectors for $75... no hole. Score!

z-nasty28

Doesn't the AIR Ports also help the catalytic converter that I don't have preform better ;-)

Mattyfresh89

haha no prob man, sweet score on the intake!

z-nasty28

Doesn't the AIR Ports also help the catalytic converter that I don't have preform better ;-) ya junk that crap..

bww3588

iTrader: (49)

The AIR system puts fresh air into the cats to help them hit light off temp faster lowering cold start up emissions. Without cats, it's useless.

And no, the EGR system does not rob any horsepower to a noticable degree. The only issue is the tube sticking down in the air stream. Other than that, it will not rob any power by changing the mixture in the combustion process. Period.

bww3588

iTrader: (49)

And no, the EGR system does not rob any horsepower to a noticable degree. The only issue is the tube sticking down in the air stream. Other than that, it will not rob any power by changing the mixture in the combustion process. Period.

z-nasty28

So putting old exhaust air back into your motor does not harm performance, is that why slp pumps fresh air from the outside atmosphere into every test dyno they run. And yes no reason to have AIR or cats or EGR of you want the most from your engine, in my opinion.

bww3588

iTrader: (49)

You have to understand how EGR works before you can argue this point.

777

iTrader: (21)

I don't really understand what you are saying by pumping fresh air into the test dyno. If you are talking about opening the hood and having a fan on...this is to keep the car cool since you are not moving (no air flow through the radiator)

Common sense will tell you clean air is better than dirty, however, it just doesn't translate into real hp gains in this case.

mike.warrenws6

Wow haha.. so im guessing this means do the block off plates... TSP sells the set for 14.99, im assuming that comes with the 2 AIR block offs, and the 2 EGR block offs?

bww3588

iTrader: (49)

Unless you are switching to an ls6 intake or headers without EGR hookups, there is no real reason other than a cleaner looking engine bay to delete them.

777

iTrader: (21)

If you want to save the $15, you can cut the flanges off of the existing EGR tubes and use some aluminum foil as a gasket to cover the open hole. Just make it fairly thick. I actually used a penny with the foil.

jdob84

iTrader: (1)

Interesting. I guess the way I pictured it in my mind didn't translate to real world. I am always open to those with more knowledge on a particular subject, and to be honest...EGR ranks low on the list of things I have studied up on.

Thanks for the correction.

bww3588

iTrader: (49)

EGR is only active during part throttle, low rpm, low engine load cruising conditions. Unless your worried about every horsepower driving down the interstate in 6th gear at 70 mph, it's a moot point.